{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-40147",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.175Z",
        "datePublished": "2025-11-12T10:23:26.556Z",
        "dateUpdated": "2026-05-11T21:43:38.854Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:43:38.854Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-throttle: fix access race during throttle policy activation\n\nOn repeated cold boots we occasionally hit a NULL pointer crash in\nblk_should_throtl() when throttling is consulted before the throttle\npolicy is fully enabled for the queue. Checking only q->td != NULL is\ninsufficient during early initialization, so blkg_to_pd() for the\nthrottle policy can still return NULL and blkg_to_tg() becomes NULL,\nwhich later gets dereferenced.\n\n Unable to handle kernel NULL pointer dereference\n at virtual address 0000000000000156\n ...\n pc : submit_bio_noacct+0x14c/0x4c8\n lr : submit_bio_noacct+0x48/0x4c8\n sp : ffff800087f0b690\n x29: ffff800087f0b690 x28: 0000000000005f90 x27: ffff00068af393c0\n x26: 0000000000080000 x25: 000000000002fbc0 x24: ffff000684ddcc70\n x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000\n x20: 0000000000080000 x19: ffff000684ddcd08 x18: ffffffffffffffff\n x17: 0000000000000000 x16: ffff80008132a550 x15: 0000ffff98020fff\n x14: 0000000000000000 x13: 1fffe000d11d7021 x12: ffff000688eb810c\n x11: ffff00077ec4bb80 x10: ffff000688dcb720 x9 : ffff80008068ef60\n x8 : 00000a6fb8a86e85 x7 : 000000000000111e x6 : 0000000000000002\n x5 : 0000000000000246 x4 : 0000000000015cff x3 : 0000000000394500\n x2 : ffff000682e35e40 x1 : 0000000000364940 x0 : 000000000000001a\n Call trace:\n  submit_bio_noacct+0x14c/0x4c8\n  verity_map+0x178/0x2c8\n  __map_bio+0x228/0x250\n  dm_submit_bio+0x1c4/0x678\n  __submit_bio+0x170/0x230\n  submit_bio_noacct_nocheck+0x16c/0x388\n  submit_bio_noacct+0x16c/0x4c8\n  submit_bio+0xb4/0x210\n  f2fs_submit_read_bio+0x4c/0xf0\n  f2fs_mpage_readpages+0x3b0/0x5f0\n  f2fs_readahead+0x90/0xe8\n\nTighten blk_throtl_activated() to also require that the throttle policy\nbit is set on the queue:\n\n  return q->td != NULL &&\n         test_bit(blkcg_policy_throtl.plid, q->blkcg_pols);\n\nThis prevents blk_should_throtl() from accessing throttle group state\nuntil policy data has been attached to blkgs."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "block/blk-cgroup.c",
                        "block/blk-cgroup.h",
                        "block/blk-throttle.c",
                        "block/blk-throttle.h"
                    ],
                    "versions": [
                        {
                            "version": "a3166c51702bb00b8f8b84022090cbab8f37be1a",
                            "lessThan": "7b4bfd02c934dbbb18814ed012ecb90b58db6935",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a3166c51702bb00b8f8b84022090cbab8f37be1a",
                            "lessThan": "6a0c394300a7b0c05504596685de8a46707171fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a3166c51702bb00b8f8b84022090cbab8f37be1a",
                            "lessThan": "bd9fd5be6bc0836820500f68fff144609fbd85a9",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "block/blk-cgroup.c",
                        "block/blk-cgroup.h",
                        "block/blk-throttle.c",
                        "block/blk-throttle.h"
                    ],
                    "versions": [
                        {
                            "version": "6.10",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.10",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.78",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.3",
                            "lessThanOrEqual": "6.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.10",
                                    "versionEndExcluding": "6.12.78"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.10",
                                    "versionEndExcluding": "6.17.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.10",
                                    "versionEndExcluding": "6.18"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7b4bfd02c934dbbb18814ed012ecb90b58db6935"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6a0c394300a7b0c05504596685de8a46707171fc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bd9fd5be6bc0836820500f68fff144609fbd85a9"
                }
            ],
            "title": "blk-throttle: fix access race during throttle policy activation",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}